Use of second generation coated conductors for efficient shielding of dc magnetic fields

Fagnard, Jean-François; Dirickx, Michel; Levin, Gilbert V.; Barnes, Paul N.; Vanderheyden, Benoît; Vanderbemden, Philippe

doi:10.1063/1.3459895

Cited by 19 publications

(17 citation statements)

References 24 publications

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“…On the other hand, the superconducting tapes are highly competent to shield DC and AC magnetic field. [15], [16] The idea is to wrap several layers of superconducting tapes around the sample, e.g. HTS bulk or tape, in order to decrease the intensity of the magnet field experienced by the sample, and, conclusively, the rate of the demagnetization would be dropped.…”

Section: Page 2 Of 4 Asc2014-2lor3b-03mentioning

confidence: 99%

Investigation of Demagnetization in HTS Stacked Tapes Implemented in Electric Machines as a Result of Crossed Magnetic Field

Baghdadi

Fagnard

Zhang

et al. 2015

IEEE Trans. Appl. Supercond.

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This paper investigates the practical effectiveness of employing superconducting stacked tapes to superconducting electric machinery. The use of superconducting bulks in various practical applications has been addressed extensively in the literature. However, in practice, dramatic demagnetization of magnetic moments would occur on superconducting bulks due to the crossed field effect. In our study, we employed the superconducting stacked tapes in a synchronous superconducting motor, which was designed and fabricated in our laboratory, aiming to lessen demagnetization due to crossed field effect in comparison with superconducting bulks. Applying the transverse AC field, the effects of frequency, amplitude, and number of cycles of the transverse magnetic field are discussed. Furthermore, a stack of 16 layers of superconducting tapes is modelled and the consequences of applying the crossed magnetic field on the sample are evaluated. The confrontation between experiments and simulation allows us to thoroughly understand the crossed field effects on stacked tapes. At the end, a preventive treatment, based on the shielding characteristic of superconductor and materials with high permeability, i.e. mu metal and metalic glass, is suggested. On the other hand, the shielding feature of aforementioned materials will hinder the penetration of magnetic field and, consequently, reduction of the demagnetization will be attained.

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Section: Page 2 Of 4 Asc2014-2lor3b-03mentioning

confidence: 99%

Investigation of Demagnetization in HTS Stacked Tapes Implemented in Electric Machines as a Result of Crossed Magnetic Field

Baghdadi

Fagnard

Zhang

et al. 2015

IEEE Trans. Appl. Supercond.

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“…Compared to the bulk high temperature superconductors (HTS), the main advantages of using such structures as magnetic shields are: (i) the higher current density, (ii) the lower weight, and (iii) the scalability of the structure, leading to higher shielded volumes. Compared to other shields made out of coated conductors [25,27], such a structure allows the persistent current to circulate around the screened volume without a superconducting joint.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally to superconducting coils [20,21] or fault current limiters [22][23][24], YBCO 2G coated conductor sections can be used to build an efficient passive magnetic screen (throughout the paper we will use the terms shield and screen interchangeably as is a common practice in literature on this subject) that is able to shield axial and DC magnetic fields [25,26]. The screen is built by milling the coated conductor sections and by placing them around a cylindrical support in order to form a jointfree superconducting loop where persistent currents can flow and provide a strong attenuation of a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of triaxial and uniaxial magnetic shields made out of YBCO coated conductors

Wera

Fagnard

Levin

et al. 2015

Supercond. Sci. Technol.

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Persistent current loops of arbitrary size can be made from currently manufactured RE123 coated conductors. Our previous work has shown that an assembly of such loops is able to shield effectively quasi static axial magnetic field due to the absence of resistive joint. The shielding effectiveness depends on the aspect ratio and the number of layers. In the present work we study experimentally the detailed magnetic response of two different configurations of the magnetic shields for various orientations of the applied field. Using a 3-axis Hall probe we determine the amplitude of magnetic field generated by the induced persistent currents and its direction with respect to the applied field. The effectiveness of the uniaxial shield decreases strongly when the applied field is not collinear with its axis. In the triaxial (Polywell type) structure comprised of three pairs of coils whose axes are mutually orthogonal, the field attenuation is shown to be only weakly dependent on the direction of the magnetic field. We discuss the properties of the triaxial shield and the ways to improve its screening performance.

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“…8,[26][27][28][29][30] Researches have also focused on the field shielding function of this joint-free coil, which has been validated by experiments. 13,14 Both the field trapping and filed shielding result from induced current, and they share a same underlying mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…field and works as a HTS magnet, which makes it promising in many HTS applications, such as MRI/NMR, machines, high field magnet and DC induction heaters. [9][10][11][12][13][14][15][16][17][18][19][20][21] Magnetization is the most important issue for this persistent current coil. Field cooling method has been widely used on HTS bulk and stack to trap field.…”

Section: Introductionmentioning

confidence: 99%

Magnetization of the joint-free high temperature superconductor (RE)Ba2Cu3Ox coil by field cooling

Zheng

Wang

et al. 2017

AIP Advances

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Joint-free (RE)Ba2Cu3Ox (REBCO) coil based on ‘wind-and-flip’ technique has been developed to generate a persistent magnetic field without power supply. This paper is to study the magnetization characteristics of the joint-free REBCO coil by field cooling, in order to trap higher field. A joint-free pancake coil is wound by REBCO tapes and the field cooling magnetization test is performed on it. An approximate numerical model based on H-formulation is built for this coil to analyze its magnetization behavior, which is validated by the experimental results Analysis show that a persistent direct current is induced in the coil during the field cooling operation, which generates the trapped field. The induced current of the joint-free coil shows an intrinsic non-uniform distribution among turns. Increasing the magnetization field and critical current of REBCO conductors can considerably increase the trapped field. But the trapping factor (the rate of trapped field to background magnetization field) reaches a maximum value (60 % for the test coil). This maximum value is an intrinsic characteristics for a fabricated coil, which only depends on the coil’s geometry structure. With a same usage of REBCO tapes, the trapping factor can be improved significantly by optimizing the coil structure to multiple pancakes, and it can approach 100 %.

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Use of second generation coated conductors for efficient shielding of dc magnetic fields

Cited by 19 publications

References 24 publications

Investigation of Demagnetization in HTS Stacked Tapes Implemented in Electric Machines as a Result of Crossed Magnetic Field

Investigation of Demagnetization in HTS Stacked Tapes Implemented in Electric Machines as a Result of Crossed Magnetic Field

A comparative study of triaxial and uniaxial magnetic shields made out of YBCO coated conductors

Magnetization of the joint-free high temperature superconductor (RE)Ba2Cu3Ox coil by field cooling

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